Xilinx Virtex UltraScale+ FPGAs

Enable RX Pattern Checker for 80-bit or 160-bit Data Widths
1. Using the DRP interface, write the following values to CH[0/1]_RX_PCS_CFG0[4:0] (address
0x080 for CH0, 0x280 for CH1):
a. CH[0/1]_RX_PCS_CFG0[4:0] = 0x12 for 80-bit data width mode.
b. CH[0/1]_RX_PCS_CFG0[4:0] = 0x14 for 160-bit data width mode.
2. Enable the PRBS checker by seng CH[0/1]_RXPRBSPTN to the required value for the
desired paern.
RX PRBS paern checker is enabled.
Disable RX Pattern Checker for 80-bit or 160-bit Data Widths
1. Disable the PRBS checker by seng CH[0/1]_RXPRBSPTN[3:0] to 4’b0000.
2. Using the DRP interface, write the following values to CH[0/1]_RX_PCS_CFG0[4:0] (address
0x083 for CH0, 0x283 for CH1):
a. CH[0/1]_RX_PCS_CFG0[4:0] = 0x09 for 80-bit data width mode.
b. CH[0/1]_RX_PCS_CFG0[4:0] = 0x0B for 160-bit data width mode.
3. Set CH[0/1]_RXPMARESETMASK = 0x0.
4. Toggle CH[0/1]_GTRXRESET High and Low.
5. Wait for CH[0/1]_RXRESETDONE to toggle High.
6. Set CH[0/1]_RXPMARESETMASK = 0x7F.
RX PRBS paern checker is disabled.
RX Buffer
The GTM transceiver RX datapath has two internal parallel clock domains used in the PCS: the
interface with PMA parallel clock domain (XCLK), and the PCS internal clock domain
(RXUSRCLK). To receive data, the RX buer provides data width conversion between these clock
domains when necessary, depending on the operang data width and encoding mode. The
following gure shows the RX datapath clock domains.
Chapter 4: Receiver
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 104
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